I cant say that a single Social media is best as every social media has some positive and negative impacts. Facebook has huge number of following, hence if you want to gain followers you can use Facebook, if you want to gain popularity, then Twitter is best and if you are looking for enhancement of business or profession then LinkedIn is the best option.
most social network sites are good, however it depends on how you use it and for which apps you want to. For instance, Instagram is now quite good for traffic pushing.
Depends on what you want from them. Facebook is good for sharing things, once you upload an image/video with a good story, it can be shared by everybody as long as it is inspiring or entertaining. Instagram is good for branding through images. Twitter is good for real time sharing & customer service conversation- if you have a news website, Twitter is perfect. LinkedIn- for networking among professionals- things related to jobs. Just my two cents
According to my point of view FB is better than all because people of all age group uses Facebook .But in current scenario pinterest and instagrm is also having good crowd .So choose accordingly your use .
Facebook is definitely the best for getting traffic and Twitter comes next. If you need niche specific traffic then try pinterest.
I agree 100%. Traffic from any social media can potentially be high quality. You need to use Social Media correctly though.
I really like FB and Instagram for increase traffic, there are also: tumblr.com bravenet.com livejournal.com